Without access to the power point, you cant see if there were pictures of the illegal off road use. It looks like the meeting was about carbon, new pine growth vs old growth and fire. There was mention of grassland and displaced birds. At the end the question was asked if illegal off road use had an impact in this. My first thought is, yes it does. As
@MOAK mentioned, one or two pictures presented in the correct light can easily sway a committee. Especially if this person is a good speaker (salesman).
The years I spent doing Adopt a Trail work, these things as well as soil erosion and water contamination issues were brought to the table by "academics" at quite a few of the forest and desert meetings. As much as it pains me to say, they were 100 percent correct. I have been around long enough to see the destruction done by people "blazing trails" with their off road vehicles. The same people screamed when forest service started closing roads. Granted, quite a few of these were made by people cutting trees but the completely trashed meadows, the hill sides where people just drove up repeatedly with nowhere to go, the paths down the center of the creeks was out of control.
This is the ammunition used against off road use, legal or illegal. I attended quite a few meeting where someone put up slide after slide of the devastation "off roaders" did. Of course, it was only the real bad areas but, now who's cherry picking? Back at my club meetings, people were outraged because its our right to drive there. So what if its only one meadow that got destroyed, it wasn't us. Ever seen the pictures of the damage done to the Race Track in Death Valley? How about where someone defaced pictographs that were a thousand years old? Because you had to drive down a long dirt road, off roaders were blamed for it. That's just two that come to mind.
The problem normally isn't the conscious off roader, its the "Yahoo". To this day, they still seem to out number us. With the factories building lifted, locked vehicles, these people have better luck "getting away from the crowds". If that means driving up a stream bed, pushing through the bush's and trees, they have a "set up" vehicle ready to do that. All it takes is someone photographing the one vehicle crashing through the brush, driving up that creek and bringing it to a meeting with the people who's job it is to keep this from happening. One person is enough to get the ball rolling for closure's to start. Once someone puts down a set of tracks, others think that's a legitimate road and follow it to see where it goes. The cycle starts there.
Back to the "meeting minuet's" in the first post, all one can do is hope the illegal off road usage isn't bad enough to force another closure. Too bad it normally does though.